Greetings.
It is pretty strange that no UI-space particle system component is included in Unity. When developing UI particle effects I found this script on Internet:
using UnityEngine;
using UnityEngine.UI;
using System.Collections.Generic;
[ExecuteInEditMode]
[RequireComponent(typeof(CanvasRenderer))]
[RequireComponent(typeof(ParticleSystem))]
public class UIParticleSystem : MaskableGraphic {
public Texture particleTexture;
public Sprite particleSprite;
// ...
}
This solution to UI-space particle system is to simply render the particles onto a texture, which can be further used in canvas rendering. The greatest part is, the script implemented in-editor particle review on 2D canvas, so that when UIParticleSystem is being used, no one would notice the re-render process and everything would looks fine on the canvas, rather than in 3D space.
Free Script - Particle Systems in UI Screen Space Overlay (https://forum.unity.com/threads/free-script-particle-systems-in-ui-screen-space-overlay.406862/)